Now that things are horribly wrong, this document is designed so that you too can erase your mistakes, improve your answers, and avoid failing the course.

 

Changing the Model:

 

·         Now that the model has been created, something is wrong and it needs to be changed.  First, in the ANSYS Utility Menu, go to Preprocessor>Modeling>Delete.  In this subcategory select what needs to be deleted.  Note:  It’s very important that when attempting to delete something that you select the appropriate category: keypoints, lines, areas, or volumes AND Below.  The “and Below” signifies that whatever line is deleted, the keypoints that form the line are also deleted.  For Areas, first the area is deleted, then the lines, then the keypoints that form the entire object, etc…  If you DO NOT want to delete the components of the incorrect object simply select Lines, Areas or Volumes and the components of the object will remain after the object is deleted.  NOTE:  Go to the ANSYS Main Menu (the top bar) and select Plot then Lines, Areas, or Volumes to check that everything that was meant to be deleted was in fact deleted.  (It is recommended that you plot one level below what you wanted to delete if possible.  Meaning if you wanted to delete an Area, plot Lines, if you wanted to delete a Volume, plot Areas or Lines.  This ensures that everything was deleted properly.)

·         From here, the incorrect object has been deleted, so re-model it using the same method as you did in the tutorial.

 

Changing Boundary Conditions and Constraints

 

·         Now that the model has been modeled, the boundary conditions applied, and the solution generated, the conditions need to be changed.  To do this, one must delete the incorrect load data and re-apply whatever condition was incorrectly applied. These are the steps to do so:

·         First, go to Preprocessor>Loads>Define Loads>Delete. From this menu, one can select any, or all, of the possible boundary conditions applied to the original model to be deleted. (Note:  This is simply a selection menu for the TYPE of Boundary Condition that will be deleted.  One must actually select the node, area, or volume to which the condition was applied.  Once the proper object is selected, click OK to remove the intended condition.)

·         Here is a step by step walk through of how to change a boundary condition starting from the endpoint of tutorial 1:

·         So… here is where we left off:

 

 

·         From here, assume the temperature applied to the right side needs to be increased to 200K and the heat flux on the left decreased to 30 W/m^2.

·         First, we will delete and replace the temperature boundary condition.

·         Go to Preprocessor>Loads>Define Loads>Delete>Temperature>On Lines.

·         A pop up window will now appear.  This window allows you to select the line or lines where a temperature boundary condition is applied so it may be deleted.

·         Select the right side of the block and click OK.

·         Now the temperature condition has been deleted.  If the simulation were to be solved right now ANSYS would then assume that both the top and right side of the block were insulated because both those sides have no boundary conditions.  Since this is not the desired effect, we must now apply the correct temperature to the right side.

·         Go to Preprocessor>Loads>Define Loads>Apply>Temperature>On Lines. 

·         Select the right side of the block and click OK.

·         The Apply Temperature window will now appear:

 

 

·         Input the new value for the temperature on the right side and click OK.

·         Now the temperature boundary condition has been changed, so delete the heat flux boundary condition and replace it with the correct value to finish the problem.

·         Go to Preprocessor>Loads>Define Loads>Delete>Heat Flux>On Lines.

·         A pop up window will now appear.  This window allows you to select the line or lines where a heat flux boundary condition is applied so it may be deleted.

·         Select the left side of the block and click OK.

·         Now go to Preprocessor>Loads>Define Loads>Apply>Heat Flux>On Lines.

·         Select the left side of the block and click OK

·         The Apply Heat Flux window will now appear:

 

 

·         Input the correct values into the window and click OK.

·         Now both the heat flux, and the temperature boundary layer have been changed so go to the ANSYS Main Menu>Solution>Analysis Type>New Analysis.

·         Select Steady State and click on OK.

·         Go to Solution>Solve>Current LS.

·         An error window may appear. Click OK on that window and ignore it.

·         Wait for ANSYS to solve the problem.

·        Click on OK and close the 'Information' window

·         At this point, the solution has been generated again, so simply select the desired means of outputting the data found and display the results.  For this example, we will output the new temperature gradient, much like tutorial 1.

·         Go to General Postprocessing>Plot Results>Contour Plot>Nodal Solution. The following window will come up:

 

 

·         Select DOF solution and Temperature to be plotted and click OK.  The new output will look like this:

 

 

Saving Projects

 

·          Simply go to Utility Menu>File>Save As… and save the project using the desired filename. To open the file later, run Interactive (the first thing explained in this tutorial) as usual, and when that is done, go to Utility Menu>File>Resume From… and choose the saved job from the directory it is saved in.